Insulator.



R. D. HILTY.

INSULATOR.

APPLICATION FILED APR. 5, 1912.

1,032,545. Patented July 16, 1912.

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ROBERT D. HILTY, OF CAREY, OHIO, ASSIG'NOR OF ONE-HALF TO'IRA N; ZEIS', 0F CAREY,

. OHIO.

INSULATOB'.

To all whom it may concern:

Be it known that I, ROBERT D. HILTY, a citizen of the United States, residing at Carey, inv the county of Wyandot and State of Ohio, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

My invention relates to insulators and is directed to the improvement of the class of insulators normally in use in-doors as contradistinguished from that class used out doors, although my invention is not necessarily limited to such in-door use. It is aimed to provide an insulator which is readily made and which may be shipped with equal readiness and with a minimum danger of breakage, it being understood that these insulators are usually made of porcelain and consequently rather fragile.

The essential endeavor of my invention is to provide an insulator of such a character that it will be more or less independent of the retaining screw which holds it and which necessarily is subject to a tendency to work loose with long wear. Actual experience has demonstrated that, varying with the quality of wood or other material into which the securing screws are forced, such securing screws have a considerable tendenoy to work loose and permit an entire separation of the parts. This danger is an ever present one and has been the proximate cause of many short-circuits.

Therefore, my invention contemplates the provision of an insulator formed of interlocking pieces which are made interlocking preferably by the utilization of a dove-tail joint. This interlocking formation of the members comprising the insulator is likewise of considerable advantage in the shipment of such insulators, for the reason that they may be shipped in assembled relation which necessarily maintains the sharp and fragile edges covered and therefore less subject to possible breakage.

In the drawings, similar characters of reference designate corresponding parts, and therein:

Figure 1 is a top plan view of my insulator, Fig. 2 is a side elevation thereof, Fig. 3 is a section taken on line 3-3 of Fig. 1, Fig. l is a section taken on line 4-4 of Fig. 8, Fig. 5 is a section taken on line 5-5 of Fig. 3, Fig. 6 is a side elevation of one of the sections comprising my insulator, and,

, Specification of Letters Patent.

Application filed April 5, 1912.

Patented July 16, 1912.

Serial No. 688,699.

Fig. '1 is a plan view of the structureshown in Fig. 6.

In the drawings, it will be understood that the sections are in duplicate, and, for purposes of brevity and succinctness, one of these sections will be described while applying the reference numerals similarly to both sections. Each section, therefore, comprises a base portion 1 having a flat table-like formation 2 with a transverse groove 3 formed therein and a relatively perpendicular surface 4 adjoining such surface 2. This relatively perpendicular surface 1 is likewise joined at its upper end by a second flat table-like surface 5 having a transverse groove 6. It will be understood that these transverse grooves are desirably corrugated although of course this is not absolutely essential.

The relatively perpendicular surface 4 is broken by a dove-tail projection 7 extending outwardly therefrom and likewise joining the table-like formation 2 upon which it is supported. Furthermore, this relatively perpendicular wall 4: is further rendered irregular by a dove-tail groove 8. The body portion 1 is preferably pierced by a bore 9 desirably having a countersunk portion 10 and arranged centrally for the reception of a securing screw in a manner which will be well understood. The base of the body portion 1 is preferably provided with spaced lugs 11 for resisting torsional stresses which result in the clamping of wires by the insulating cleat.

In operation, it will be understood that the wires are placed in the grooves 3 and 6 and the sections are moved into interlocking relation by inserting the projection 7 into the complemental dove-tail groove 8. When in this position, the screw may be driven into position through the bores provided therefor and into the surface upon which the insulator is to be mounted. While the screw is ordinarily effective to maintain the insulating element-s against relative movement, the screw is further assisted in such action by the formation of the elements with relation to each other, for the apparent reason that it is impossible for the elements to move laterally in relation to each other. As hitherto pointed out, this feature is advantageous for practical use to guard against the intenseparation of the members of the insulator, due to the wearing loose of the screw, but is almost equally advantageous for the purposes of shipment. Furthermore, in actual use the dove-tail formation produces two inter-locking elements forming a complete insulator and necessarily effecting a maximum degree of strength due mainly to such dove-tail formations.

'What I claim, is

In an insulator, a duplicate section comprising a body portion, a lower plane sur face, an upper plane surface, an intermediate wall of substantially relative perpendicularity, a dove-tail projection on said substantially perpendicular surface, said 15 perpendicular surface having a dove-tail groove formed therein.

In testimony whereof I a'llix my signature in presence of two witnesses.

ROBERT D. HILTY.

Witnesses:

E. Gr. LAUGI-ILIN, I. N. Znrs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

